Comprehensive treatment system and method for desulfurization wastewater of coal-fired power plant

Abstract

The invention discloses a comprehensive treatment system and method for desulfurization wastewater of a coal-fired power plant. The system comprises an incoming water pipeline, an aeration oxidation tank, an extraction dechlorination treatment device, a reaction and precipitation integrated device, an electronic flocculator, a rapid centrifugal concentrator, a multi-medium filter, a defluorinationfilter, a clear water tank, a sodium hypochlorite adding device, an aeration fan, an organic extractant adding device, a reverse extraction regeneration treatment device, a lime milk adding device, ahydrochloric acid adding device and an organic sulfur adding device, according to the system and the method, in-plant reuse of the desulfurization wastewater can be achieved, the investment cost andthe operation cost are low, the occupied area is saved, and the operation and maintenance difficulty is low.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment in coal-fired power plants, and relates to a comprehensive treatment system and method for desulfurization waste water in coal-fired power plants. Background technique [0002] With the increasingly stringent national environmental protection policies and standards, the pollutant discharge permit gradually requires coal-fired power plants to realize the trend of no discharge of wastewater from the whole plant. The reuse of desulfurization wastewater or entering the terminal treatment is the key to the realization of no discharge of wastewater from the whole plant. At present, the terminal wastewater zero discharge treatment process promoted by power plants is a standard discharge treatment system + terminal treatment system. [0003] The water quality of desulfurization wastewater from coal-fired power plants is very complex and fluctuates greatly. It has the characteristics of "high...

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Problems solved by technology

[0003] The water quality of desulfurization wastewater from coal-fired power plants is very complex and fluctuates greatly. It has the characteristics of "high hardness, high salinity, high turbidity, and strong corrosion". This technology is mature, easy to operate, and low in operating costs, but in the actual operation of the power plant, there are many problems due to various reasons

The three-box process is a simple chemical precipitation method, the operation and maintenance process is complicated, and the effluent water quality is unstable. According to the investigation, the fluoride ion, ammonia nitrogen, COD and suspended matter in the effluent of some coal-fired power plants desulfurization wastewater three-box process cannot be stably up to the standard, and the chloride ion Almost no treatment effect, can not be reused in the factory

There is no pre-sedimentation link in the three-box process, and a large amount of suspended matter has a great impact on subsequent process equipment, which is easy to foul and block, and the amount of sludge generated is high. The investment and operation costs of the sludge treatment system are large, and the floor area is large.

[0004] The process of pre-concentration + evaporative crystallization or flue gas evaporation adopted by the terminal treatment system can prevent the wastewater from the whole plant from being discharged, but this technology not only has high investment and operating costs, occupies a large area, and is difficult to operate and maintain

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